How do I debug my DNS/network issues?

In this article I will explain the various different ways you can troubleshoot a network related issue, which might be preventing you from loading a website or loading the wrong version of a website.

Do I need to flush my DNS?

You might need to flush your DNS if you have made changes to your domain DNS records but you’re still getting the old ones returned. For example, If you have made a new website with a new provider, but when you visit your website address you are still seeing the old one.

Google DNS

If you are using the public Google DNS servers and you believe the records they have aren’t up to date. You can use their Flush Cache system to force update the cache on a per domain basis. See the example below for how you’d do it for pipeten.com
google-dns-flush


Windows

Windows 8/8.1/10:

If you’re running one of these versions of Windows, first you’ll need to make sure you’re looking at the Windows Desktop.

  1. Right click on the Start button
  2. Select Command Prompt (Admin)
  3. Type in ipconfig /flushdns
  4. Restart your system if possible, try visiting the site again.

Windows Vista/7:

If you’re running either of these versions of Windows, the process is as below:

  1. Click on the start menu
  2. Type “cmd” in the search box
  3. Right click “cmd” at the top and select Run as Administrator
  4. enter into the prompt: ipconfig /flushdns
  5. Restart your system if possible, try visiting the site again.

Windows 98/NT/XP/2000:

dnsclear-windows

  1. Click – Start
  2. Click – Run
  3. Type – cmd (command on some systems)
  4. Click – OK
  5. Type – ipconfig /flushdns
  6. Restart your system (if possible) and try visiting the site again.

Apple Mac

If you are running any version of Mac OS X:

  1. Open up a command terminal.
  2. Run the command sudo killall -HUP mDNSResponder

Mac OS X 10.10 (Yosemite):

  1. Open up a command terminal
  2. Run the command sudo discoveryutil udnsflushcaches

Mac OS X 10.6 (Snow Leopard):

  1. Open up a command terminal.
  2. Run the command dscacheutil -flushcache

Mac OS X 10.5.1:

  1. Open a command terminal.
  2. Run the command lookupd -flushcache

Linux

nscd Name Service Cache Daemon:

  1. Open up a command terminal (either as root or run step 2 with sudo)
  2. Run the command /etc/init.d/nscd restart

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